Tool head



May 5, 1936. c. H. HOWLAND-SHEARMAN TOOL HEAD Filed July 27, 1934 2 Sheets-Sheet 1 INVENTOR amass 1i Hmzm fi'MEWJPMM 'ATTORNE'Y- May 5, 1936,

C. H. HOWLAND-SHEARMAN TOOL HEAD Filed July 2'7, 1934 2 Sheets-Sheet 2 'INVENTOR a'mamyamu -dimzam -ATTORNEY Patented May 1936 UNITED STATES PATENT OFFICE 2,039,849. root mean blur-lea n, Rowland-Shannan, Hamden, Conn. Application July 27, 1934, se ial-N 137,159 1 Claim. (01. 184-118) This, invention pertains to improvements in; tool heads for certain types of machine tools. While it is particularly intended for use on the Kinetor or cold flowing machine fully disclosed in copendingapplication Serial No. 137,160, filed July 27, 1934, its use is not limited thereto, as it may be applied to various other machines such as punch presses, breaching machines and the like.

An object of the invention is to provide rigid and accurate means for holding the working tools. l

' Another object is to provide means by which the working tools are rendered easily in terchangeable.

A further object is to provide, for holding a plurality of tools in a single mounting.

A still further object is to provide means for accurately locating the work with respect to the 2 tool or tools. 7

Other objects will appear in the following description in connection with the attached drawings, in which: I,

Figure 1 is an exterior view of a machine tool head embodying the invention;

Figure 2 is a vertical section of the same in the plane 2-2, Figure 1; e

Figure 3 is an enlarged detail partial section of the tool holder mounting;

Figure 4 is a fragmental section of the same on the lines 4-4, Figure 3;

Figure 5 is a fragmental view illustrating the manner of demounting the tool holder;

Figure 6 is an end view of the demounting wrench; V

Figure 7 is a side elevation of the same; 1

Figure 8 is a side elevation of one form of tool;

Figure 9 is a vertical sectional view of a guide or contact shoe for use with a single tool;

Figure 10 is.a plan view of the sleeve nose adapted to receive the contact shoe;

Figure 11 is a vertical section of the same;

Figure 12 is an enlarged sectional view of 1 the work positioning'device shown in Figures 1 and 2;

Figure 13 is a'fragmental side elevation of a locating knife shown in Figure 12; and

Figure 14 isa cross sectionalview in the plane "-14, Figure 2, illustrating the method of loeating a work piece.

Referring to Figures 1 andz, a ram 20 is vertically slidable in a guide 21 secured to the stationary frame or body 22 of a machine tool.

Secured to the ram 261 and forming the'lower I 5 part thereof is a cylindrical flanged member 23.

The member ,.23 contains a rectangular hole 23 adapted tosecure the square shank 25 of a tool holder 28. A flange 21 onthe holder 23 isconcentrically socketed in the lower portion of the member 23. 5

A tapered cross hole 23,*having a semi-cylindrical upper surface 23, and a corresponding hole 30 through the shank 25 are adapted to receive a tapered key 3|. When the key 3| isdriven home as shown in Figure}, the shank 25 is 10 wedged upward, thus drawing the flange 21 firmly home in its socket in the member 23. The flange 21 may be slightly tapered to ensure a tight flt. To remove the tool holder, the key 3| is first driven'out, a hole 32 being provided in the flange 15 33 on a slidable outer shell 34, hereinafter described, to admit a drift pin. The outer flange 33 is also cut away at 35, Figures 1 and 3, to permit egress of the key 31. To dislodge theitool angular cam tip 31 is inserted in the cross hole '28 until the cam 31 enters the hole 30 in shank 2 5 and engages the bottom thereof angularly as: shown in Figure 5. The handle 38 of the wrench 36 is now swung counterclockwise as shown in 25 dot and dash lines, Figure 5, causing the cam 31 to force the shank 2i downward, thus loosening the flange 21 from its socket. The wrench 36 is'removed, a V groove 33 in the bottom of cross hole 28 facilitating the egress of the cam 30 31, and the holder 26 may then'be dropped out of'place. L

In the single tool mounting illustrated in Fi ures 1, 2, 3, and 4, a tool 40 of the type shown in Figure 8 is used. The tool 40 has an upper threaded portion ll adapted to be screwed in to a thread 42 "in holder 26, and is properly alined with 26 by an enlarged cylindrical portion 43 accurately fitted to'a guide recess 44. Flats 45 are provided to engage a wrench for screwing 40 the tool 40 into the holder 26. It is obviousthat the lower portion a of tool 0 herein shown as cylindrical may have any other cross section according to the shape of the hole which is to be produced by it. 45

.of the shell 34, and are slidably guided in the lower ram member 23. Nuts 88 on bolts 69 through thesleeves ilaredisnosedinslotsnintheram 28 and engage the top of member 28, thereby detel-mining the lower limit to which the shell 84 can slide on the member 28.

- Upward extensions II and 12 of the shell 84, Figurelarespannedbyacrosskeyllwhich passes through a vertical slot 14 in the lower ram member 28 and engages a central plug 15 slidable in 28. A heavy compression spring I8 disposed in a central hole 11 in ramv 28 and member 28, presses the plugl5, key 18 and shell 34 downward. The shell 24 and related parts thus constitute a clamping member or fracture'proofer of the type fully disclosed in copending application Serial No. 737,156, flied July 27, 1934 being adapted to be pressed against a work piece 18 supported by the machine table 18 as the tool 48 is forced through 18, the pressure with which the plate or shoe 84 holds the piece I8 clamped increasing as the spring 18 is further compressed by'the downward movement of the ram 28.

A pair of finders 88 and 81, Figures 1 and 2, are bolted and doweled to the shell 34 at 90 angular distance from each other as shown in Figure 14. Figures 12 and 13 show the structure of the finder 88, this structure being typical of both these devices. Referring to Figure 12, a cylindrical body 82 has an upper inclined lip 88 provided with a dowel pin 84 and bolt hole 85 for attachment to sleeve 84. A plunger 88, having a reduced shank 81 slidably guided in a screwed bushing 88, is pressed downward in body 82 by a spring 88. A flat nose 88 of a screw 8| threaded into a boss 82 on body 82 slidably engagesa longitudinal v groove 83 on the plunger 88, thereby preventing 88 from turning. The lower end of the shank 81 is ground oil angularly to form a knife or chisel edge 84 as shown in Figure 13. when finders 88 and 8| areboltedtotheshell 84thelines of thin knife edges 84 and 84a. cros exactly on the center line of the tool 48.

The operation of the locating finders is as follows: It being desired, for example, to pierce the work piece I8, Figure 14, at a location whose center is indicated by the numeral 88, lines 88 and and at right angles to each other. The piece 18,

is then placed on table 18 beneath the tool head and moved about until the knife edges 84 and 84a aline with the scribe lines is and 91. The point ing device carrying means for locating work without the use of punch marks or fixtures.

While the invention is illustrated in preferred forniit is not limited to the precise structures shown, as various modifications may be made without departing from the scope of the appended claim.

What is claimed is:

In combination, a hollow ram having an annular recess-in one end thereof and a flat shoulderattheinnerendofsaid including a disk having its periphery closely fitted in said recess and a flat face engaging shoulden'a rigid shank on said disk projecting into said ram beyond said shoulder and having a transverse opening, a tool secured in said holder, and a removable tapered cross key normally retained in said ram and engaging said transverse;opening to secure said disk, in said recess, said opening having -a wall surface adapted to fit a wrench, said wrench having thereon a cam cooperative with said shank to dislodge said disk'from said recess hen said key has been removed.

CHARLES H.

HOWLAND-HSHEARMAN.

recess, a tool holder.

said30 

